Method for transferring a feed strip of a material web onto a winding device

ABSTRACT

A winding apparatus for transferring a web from a carrier drum to a spool. Pressure between the spool and the carrier drum is higher in the area of the feed strip of the web by applying a higher contact force, or by orienting the spool and drum at an angle to one another.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a National Stage Application of InternationalApplication No. PCT/EP2003/050306, filed Jul. 15, 2003. Further, thepresent application claims priority under 35 U.S.C. 119 of Germanapplication DE 102 34 958.4, filed Jul. 31, 2002.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a method for transferring a feed strip of amaterial web, in particular a paper or cardboard web, onto a windingdevice for winding the material web onto a spool, in which the materialweb or the feed strip is led over a carrier drum and a winding nip isformed between the carrier drum and the spool. It further relates to awinding apparatus for winding a material web, in particular a paper orboard web, onto a spool, in which the material web is led over a carrierdrum and a winding nip is formed between the carrier drum and the spool.

2. Discussion of Background Information

Winding devices of the aforementioned type are known, for example fromthe documents DE 198 22 261 A1, DE 198 52 257 A1, DE 199 39 506 A1, WO98/52858 and EP 0 483 092 B1.

The previous general sequence of a corresponding feed operation in apapermaking machine comprises the following steps:

-   -   At the end of the drying section, that is to say on the last        drying cylinder, the paper web is run at full width into the        pulper.    -   A strip is cut, for example by means of a tip cutter.    -   The strip is taken off the last drying cylinder and transferred        to a winding device or reel-up by means of a rope guide, vacuum        tapes, air plate and/or the like.    -   The strip is raised up and pulled tight.    -   The strip is run to the full web width.

In this case, the clamping point used for the strip is the winding nipor nip formed between a carrier drum and an empty spool.

The line force in the nip is produced by pressing, the empty spool beingpressed appropriately against the carrier drum or the carrier drum beingpressed appropriately against the empty spool.

Pressing the empty spool against the carrier drum or the carrier drumagainst the empty spool is usually carried out by means of two hydrauliccylinders, one of which is provided on the operator side and one on thedrive side and which are acted on with the same pressure. The result ofthe uniform pressing or identical pressing force on the operator sideand the drive side is a nip which is closed over its entire width.

Moreover, in general a feed position has hitherto been provided on therail or between the changeover position and the horizontal position onthe rail. The distribution of the line force has hitherto generallydepended on the following variables:

-   -   level of the pressing force    -   changeover position (changeover angle)    -   rigidity of carrier drum and spool    -   design of the surfaces of carrier drum and spool (steel, rubber        covering, hardness)    -   diameter of carrier drum and spool.

In this case, the distribution of the line force or pressure withrespect to the center of the machine has hitherto always beensymmetrical.

During the feeding or transfer of the feed strip, problems can occur inparticular in the case of a rubber-covered carrier drum that has shrunk.For example, a carrier drum that has shrunk signifies a reduction indiameter. The nip force or pressure is lower at the relevant point, inthe extreme case it being possible for the nip even to be open at therelevant point, that is to say no longer fully closed. The transferstrip can then no longer be gripped.

SUMMARY OF THE INVENTION

According to the invention, there is provided an improved method and animproved winding device in which the aforementioned problems areeliminated. In this case, the intention is in particular to ensure thatthe winding nip or nip is in every case closed at the point at which thetransfer strip arrives.

With respect to the method, according to the invention, the line forcein the winding nip is set to a higher value in the region of the feedstrip than in the remaining region of the winding nip during thetransfer of the feed strip.

If the feed strip is led through the winding nip in one of the twolateral edge regions, then the line force is preferably set to a highervalue in the relevant lateral edge region of the winding nip than in theother lateral edge region. In this case, the line force in the otherlateral edge region can even be set to the value zero.

According to a practical refinement of the method according to theinvention, the line force on the operator side and on the drive side ofthe winding nip are set to different values, with a higher value on theside of the feed strip.

The line force in the winding nip can be set, for example, via a movableor displaceable spool and/or via a movable or adjustable carrier drum.

If the line force in the winding nip is set via a movable ordisplaceable spool, then, advantageously, the spool is pressed morefirmly against the carrier drum in the region of the feed strip than inthe remaining region of the winding nip.

The spool can also be set obliquely with respect to the carrier drum.

A stationary carrier drum is expediently used.

The feed strip can be fed to the winding device in the primary region orin the secondary region, for example. What is to be understood by such aprimary and secondary region of the winding device is familiar to thoseskilled in the art and, for example, may be gleaned from the documentsmentioned on page 1 of the instant specification. For example, a newspool can be provided in the primary region and brought into a spoolchanging position, in which it forms a new winding nip with the carrierdrum. For this purpose, for example, a primary transport device can beprovided. Then, for example, a secondary transport device can take overthe new spool with the started new wound reel.

The invention can therefore be applied, for example, in a winding deviceas is described in EP 0 483 092 B1 and in which the line force in thewinding nip can be set via a movable or displaceable spool. The contentof this document is hereby incorporated by reference in the content ofthe present application.

According to an alternative expedient refinement of the method accordingto the invention, the line force in the winding nip is set via a movableor displaceable carrier drum.

If the line force in the winding nip is set via a movable ordisplaceable carrier drum, then the carrier drum is preferably pressedmore firmly against the spool in the region of the feed strip than inthe remaining region of the winding nip.

The carrier drum is expediently set obliquely with respect to the spool.

The spool can in particular be stationary or movable in order tocompensate for the increase in the winding diameter.

The feed strip can be fed to the winding device either in the primaryregion or in the secondary region.

The invention can therefore also be applied in a winding device as isdescribed for example in WO 98/52858 and in which the line force in thewinding nip can be set via a movable or displaceable spool.

By the method according to the invention, secure closure of the windingnip at which the feed strip arrives is ensured. In most cases, the feedstrip will be supplied on the operator side. Corresponding reliableclosure of the nip is achieved in particular by pressing more firmly atthe relevant point of the winding nip, it being possible for the windingnip on the opposite side even to be opened, that is to say on theopposite side the line force can even be reduced to the value zero.

Care is therefore taken to have an asymmetrical distribution of the lineforce, it being possible in particular for the line force on theoperator side to be different from that on the drive side.

On the side facing away from the feed strip, the carrier drum or thespool can be set obliquely. On the side facing away from the feed strip,for example on the drive side, the result is then a zero line force.

In the case in which the line force in the winding nip can be set via amovable or displaceable carrier drum, the procedure can be as follows.

In order to open the side of the nip facing away from the feed strip,the carrier drum is set obliquely. This can be done as follows, forexample:

-   -   The carrier drum is moved away, for example hydraulically via        cylinders for pressing on the carrier drum, it being possible        for the position of the empty spool in the primary arm of the        primary mounting to be fixed.    -   Alternatively, the carrier drum can be moved away via an        additional cylinder.    -   The spool can be moved away, for example, via an electric drive,        for example a servomotor or the like. The carrier drum on the        relevant side can move against a stop.

The feed strip can be fed, for example, in the primary region (positionof the empty spool fixed in the primary arm) or in the secondary region(position of the entry spool given by secondary carriage).

In the case of feeding in the primary region, the carrier drum can bemoved away, for example hydraulically via cylinders for pressing on thecarrier drum, on the side facing away from the feed strip, for examplethe drive side, which results in a corresponding gap. It is alsopossible for the carrier drum on the side facing away from the feedstrip, for example the drive side, to move against a stop, whichlikewise again results in a corresponding gap.

In the case of feeding the feed strip in a secondary region, the carrierdrum can be moved away, for example hydraulically via cylinders forpressing on the carrier drum on the side facing away from the feedstrip, in particular the drive side, which results in a correspondinggap. It is also possible for the secondary carriage to be moved away onthe side facing away from the feed strip, for example the drive side, tosuch an extent that the carrier drum on the side facing away from thestrip moves against a stop, which again results in a corresponding gap.

Even if the line force in the winding nip can be set via a movable ordisplaceable spool, the feeding can, for example, again be carried outin the primary region or in the secondary region of the winding device.

In the case of feeding in the primary region (empty spool clamped in theprimary carriage/primary carriage movable relative to the primary arm ofthe primary mounting), for example the following steps are conceivable:

-   -   The primary carriage is moved away, for example hydraulically,        on the side facing away from the feed strip, for example the        drive side, which results in a corresponding gap.    -   The primary carriage is moved against a stop, which again        results in a corresponding gap.

In the case of such feeding in the primary region, in general the spoolholder can be opened somewhat.

In the case of feeding in the secondary region (empty spool clamped inthe secondary carriage), in the present case of exerting a correspondinginfluence on the line force via the movable or displaceable spool, theprocedure can be as follows, for example:

-   -   The secondary carriage is moved away, for example hydraulically,        from the carrier drum on the side facing away from the feed        strip, for example on the drive side, which results in a        corresponding gap.    -   The secondary carriage is moved against a stop, which results in        a corresponding gap.

In the case of feeding in the secondary region (empty spool pressedagainst carrier drum by way of secondary levers), the procedure can alsobe as follows, for example:

-   -   The secondary lever is not applied completely, in order to        obtain an appropriate gap.    -   The secondary lever is moved against a stop in order to obtain        an appropriate gap.

In the case of feeding in the secondary region, in the case of exertingan appropriate influence on the line force via a movable or displaceablespool, the procedure can therefore be such, for example, that thesecondary lever or secondary carriage is not applied completely, fromwhich it follows that the empty spool does not rest on completely.

The winding device according to the invention is accordinglycharacterized in that, in order to transfer a feed strip of the materialweb, the line force in the winding nip can be set to a higher value inthe region of the feed strip than in the remaining region of the windingnip.

According to one aspect of the invention, there is provided a method fortransferring a feed strip of a web, made of one of paper or cardboard,onto a winding device for winding the web onto a spool, the methodcomprising leading the feed strip over a carrier drum, forming a windingnip between the carrier drum and the spool, and setting a line force inthe winding nip at a higher value in the region of the feed strip thanin the remaining region of the winding nip during transfer of the feedstrip.

The method according to the invention may further comprise leading thefeed strip through the winding nip in one of two lateral edge regions ofthe winding nip and setting the line force to a higher value in one edgeregion of the winding nip than in another lateral edge region.Additionally, the method may comprise setting the line force in anotherlateral edge region to the value zero.

According to the invention, the winding nip includes a drive side and anoperator side and the method may further comprise setting the line forceon the operator side and on the drive side of the winding nip todifferent values. Furthermore, the method may comprise one of, movingand displacing the spool to set the line force. Additionally, the methodmay comprise pressing the spool more firmly against the carrier drum inthe region of the feed strip than in the remaining region of the windingnip. The spool may be arranged obliquely with respect to the carrierdrum. Furthermore, the carrier drum may be made stationary.

Additionally, according to the invention the feed strip may be fed in aprimary region of the winding device. Alternatively, the feed strip maybe fed in a secondary region of the winding device. The carrier drum maybe moved to set the line force in the winding nip. According to theinvention, the carrier drum may be pressed more firmly against the spoolin the region of the feed strip than in the remaining region of thewinding nip. The carrier drum may be arranged obliquely with respect tothe spool. The spool may be stationary. Alternatively, the spool may bemovable in order to compensate for the increase in the winding diameter.

According to another aspect of the invention, a winding device forwinding a web, made of one of paper or cardboard, comprises a spool ontowhich the web is to be wound, a carrier drum over which the web is led,the spool and drum being in contact to form a line of force along awinding nip. The web has a feed strip for transferring the web from thecarrier to the spool, and the line force in the winding nip is set to ahigher value in the region of the feed strip than in the remainingregion of the winding nip. The winding device may further comprise twolateral edge regions on the winding nip, the feed strip being ledthrough one of the two lateral edge regions, the line force being higherin the one edge region of the winding nip than in the other lateral edgeregion. The winding device may comprise a line force in the otherlateral edge region which is set to the value zero. The winding nip mayinclude an operator side and a drive side. The spool may be one of,movable and displaceable to set the line force. The line force may begreater in the region of the feed strip than in the remaining region ofthe winding nip. The spool may be set obliquely with respect to thecarrier drum. The carrier drum may be stationary. The winding device mayfurther comprise a primary and a secondary winding region, the feedstrip being fed in the primary winding region of the winding device.Alternatively, the feed strip may be fed in the secondary winding regionof the winding device.

According to yet another aspect of the invention, a method fortransferring a feed strip of a web, made of one of paper or cardboard,onto a winding device for winding the web onto a spool, comprisesleading the feed strip over a carrier drum, forming a winding nipbetween the carrier drum and the spool, setting a line force in thewinding nip at a higher value in the region of the feed strip than inthe remaining region of the winding nip during transfer of the feedstrip, and leading the feed strip through the winding nip in one of twolateral edge regions of the winding nip. The winding nip includes adrive side and an operator side and further comprises setting the lineforce on the operator side and on the drive side of the winding nip todifferent values, the method further comprising pressing the spool morefirmly against the carrier drum in the region of the feed strip than inthe remaining region of the winding nip.

According to the invention, a winding device for winding a web, made ofone of paper or cardboard, comprises a spool onto which the web is to bewound, a carrier drum over which the web is led, the spool and drumbeing in contact to form a line of force along a winding nip, the webhaving a feed strip for transferring the web from the carrier to thespool, wherein the line force in the winding nip is set to a highervalue in the region of the feed strip than in the remaining region ofthe winding nip. The feed strip is led through one of two lateral edgeregions on the winding nip, the line force being higher in the one edgeregion of the winding nip than in the other lateral edge region, whereinthe winding nip includes an operator side and a drive side, and thespool is one of, movable and displaceable to set the line force.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described in more detail in the following textusing an exemplary embodiment and with reference to the drawing, inwhich:

FIG. 1 shows a schematic plan view of a winding device according to theprior art, in which a movable or displaceable carrier drum is pressedagainst the spool with equally high pressing forces on the two sidesuntil the feed strip is transferred,

FIG. 2 shows a schematic plan view of a winding device according to theinvention, in which the movable or displaceable carrier drum is pressedagainst the spool with a higher pressing force on the side of the feedstrip than on the other side, in each case a pressing force greater thanzero being produced on both sides, and

FIG. 3 shows a schematic plan view of a further embodiment of thewinding device according to the invention, but in the present case thecarrier drums being set obliquely, that is to say the winding nip on theside facing away from the feed strip being opened, so that the pressingforce on this side is reduced to zero.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a schematic plan view of the winding device 10 according tothe prior art, in which a movable or displaceable carrier drum 12 ispressed against the spool 14 with equally high pressing forces F₁, F₂ onthe two sides during the transfer of the feed strip. The result is thusa symmetrical distribution of the line force LK in the nip or windingnip 16 formed between the carrier drum 12 and the spool 14.

FIG. 2 shows a schematic plan view of an exemplary embodiment of awinding device 18 according to the invention for winding a material web,in particular a paper or cardboard web, onto a spool 20, in which thematerial web or the feed strip is again led over a carrier drum 22 and awinding nip 24 is formed between the carrier drum 22 and the spool 20.

In the present exemplary embodiment of the winding device 18 accordingto the invention, the movable displaceable carrier drum 22 is pressedagainst the spool 20 with a higher pressing force F₁ on the side of thefeed strip than on the other side. In the present case, a pressing forcegreater than zero is produced on the two sides in each case, which meansthat even the pressing force F₂ on the side facing away from the feedstrip, which is smaller as compared with the pressing force F₁, is stillgreater than zero.

FIG. 3 shows a schematic plan view of a further embodiment of thewinding device 18 according to the invention.

In FIG. 3, the carrier drum 22 is set obliquely with respect to thespool 20, however, so that the carrier drum 22 is only pressed againstthe spool 20 with the pressing force F₁ on the side of the feed strip,while the winding nip 24 on the side facing away from the feed strip isopened by the amount a, so that the pressing force is reduced to zero onthis side.

In the case of FIG. 3, the result is thus again an asymmetricaldistribution of the line force LK.

LIST OF DESIGNATIONS

-   10 Winding device-   12 Carrier drum-   14 Spool-   16 Winding nip, nip-   18 Winding device-   20 Spool-   22 Carrier drum-   24 Winding nip, nip-   LK Line force-   a Amount

1. A method for transferring a feed strip of a web, made of one of paperor cardboard, onto a winding device for winding the web onto a spool,the method comprising: leading the feed strip over a carrier drum;forming a winding nip between the carrier drum and the spool; andsetting a line force in the winding nip to produce a distribution of theline force over a width of the nip, the line force being set at a highervalue in the region of the feed strip than in the remaining region ofthe winding nip the line force being produced by at least one of,pressing the spool against the carrier drum and the carrier drum beingpressed against the spool; and maintaining the line force in the windingnip at the higher value in the region of the feed strip than in theremaining region during transfer of the feed strip onto the windingdevice.
 2. The method of claim 1, further comprising: leading the feedstrip through the winding nip in one of two lateral edge regions of thewinding nip; and setting the line force to a higher value in one edgeregion of the winding nip than in another lateral edge region.
 3. Themethod of claim 2, further comprising: setting the line force in saidanother lateral edge region to the value zero.
 4. The method of claim 2,wherein the winding nip includes a drive side and an operator side andfurther comprising setting the line force on the operator side and onthe drive side of the winding nip to different values.
 5. The method ofclaim 1, further comprising one of, moving and displacing the spool toset the line force.
 6. The method of claim 5, further comprising:pressing the spool more firmly against the carrier drum in the region ofthe feed strip than in the remaining region of the winding nip.
 7. Themethod of claim 5, further comprising: arranging the spool obliquelywith respect to the carrier drum.
 8. The method of claim 5, furthercomprising: making the carrier drum stationary.
 9. The method of claim5, further comprising: feeding the feed strip in a primary region of thewinding device.
 10. The method of claim 5, further comprising: feedingthe feed strip in a secondary region of the winding device.
 11. Themethod of claim 1, further comprising: moving the carrier drum to setthe line force in the winding nip.
 12. The method of claim 11, furthercomprising: pressing the carrier drum more firmly against the spool inthe region of the feed strip than in the remaining region of the windingnip.
 13. The method of claim 11, further comprising: arranging thecarrier drum obliquely with respect to the spool.
 14. The method ofclaim 11, wherein the spool is stationary.
 15. The method of claim 11,wherein the spool is movable in order to compensate for the increase inthe winding diameter.
 16. The method of claim 11, further comprising:feeding the feed strip in a primary region of the winding device. 17.The method of claim 11, further comprising: feeding the feed strip in asecondary region of the winding device.
 18. A winding device for windinga web, made of one of paper or cardboard, the winding device comprising:a spool onto which the web is to be wound; a carrier drum over which theweb is led; the spool and drum being in contact to form a line of forcealong a winding nip; said web having a feed strip for transferring saidweb from the carrier drum to the spool, and wherein the line force inthe winding nip is set to a higher value in the region of the feed stripthan in the remaining region of the winding nip whereby the line forcein the winding nip is maintained at the higher value in the region ofthe feed strip than in the remaining region during transfer of the feedstrip onto the winding device.
 19. The winding device as claimed inclaim 18, further comprising: two lateral edge regions on said windingnip, said feed strip being led through one of the two lateral edgeregions, the line force being higher in said one edge region of thewinding nip than in the other lateral edge region.
 20. The windingdevice as claimed in claim 19, wherein the line force in said otherlateral edge region is set to the value zero.
 21. The winding device asclaimed in claim 19, wherein the winding nip includes an operator sideand a drive side.
 22. The winding device as claimed in claim 18, whereinsaid spool is one of, movable and displaceable to set the line force.23. The winding device as claimed in claim 22, wherein the line force isgreater in the region of the feed strip than in the remaining region ofthe winding nip.
 24. The winding device as claimed in claim 22, whereinthe spool is set obliquely with respect to the carrier drum.
 25. Thewinding device as claimed in claim 22, wherein the carrier drum isstationary.
 26. The winding device as claimed in claim 22, furthercomprising a primary and a secondary winding region, the feed stripbeing fed in the primary winding region of the winding device.
 27. Thewinding device as claimed in claim 22, further comprising a primary anda secondary winding region, the feed strip being fed in the secondarywinding region of the winding device.
 28. The winding device as claimedin claim 18, wherein the carrier drum is one of, movable anddisplaceable to set the line force in the winding nip.
 29. The windingdevice as claimed in claim 28, wherein the line force is greater in theregion of the feed strip than in the remaining region of the windingnip.
 30. The winding device as claimed in claim 28, wherein the carrierdrum is set obliquely with respect to the spool.
 31. The winding deviceas claimed in claim 28, wherein the spool is stationary.
 32. The windingdevice as claimed in claim 28, wherein the feed strip is fed in aprimary region of the winding device.
 33. The winding device as claimedin claim 28, wherein the feed strip is fed in a secondary region of thewinding device.
 34. A method for transferring a feed strip of a web,made of one of paper or cardboard, onto a winding device for winding theweb onto a spool, the method comprising: leading the feed strip over acarrier drum; forming a winding nip between the carrier drum and thespool; setting a line force in the winding nip at a higher value in theregion of the feed strip than in the remaining region of the windingnip; maintaining the line force in the winding nip at the higher valuein the region of the feed strip than in the remaining region duringtransfer of the feed strip; leading the feed strip through the windingnip in one of two lateral edge regions of the winding nip; the windingnip including a drive side and an operator side and further comprisingsetting the line force on the operator side and on the drive side of thewinding nip to different values; and pressing the spool more firmlyagainst the carrier drum in the region of the feed strip than in theremaining region of the winding nip.
 35. A winding device for winding aweb, made of one of paper or cardboard, the winding device comprising: aspool onto which the web is to be wound; a carrier drum over which theweb is led; the spool and drum being in contact to form a line of forcealong a winding nip; said web having a feed strip for transferring saidweb from the carrier drum to the spool, wherein the line force in thewinding nip is set to a higher value in the region of the feed stripthan in the remaining region of the winding nip; said feed strip beingled through one of two lateral edge regions on said winding nip, theline force being higher in said one edge region of the winding nip thanin the other lateral edge region and the higher line force beingmaintained in the one edge region of the winding nip, wherein thewinding nip includes an operator side and a drive side, and said spoolbeing one of, movable and displaceable to set the line force.